Piston
AssigneeMahle International GmbH
InventorsJuergen Rudi, Ralf Braig
Life of this patent
Estimating the term…
Abstract
A piston for an internal combustion engine may include two pin bosses configured to receive a gudgeon pin. The two pin bosses may respectively include a nadir pocket of at least two nadir pockets at α=180° and extending outward from a piston axis. The at least two nadir pockets may have a respective length that is smaller than a length of a respective pin boss of the at least two pin bosses. The piston may also include a pin boss axis that is axially offset from the piston axis by 0.1-1.0 mm.
Claims20
A piston for an internal combustion engine, comprising two pin bosses configured to receive a gudgeon pin, the two pin bosses respectively including a nadir pocket of at least two nadir pockets at α=180°, the at least two nadir pockets each extending outward from a piston axis and having a respective length along a pin boss axis that is smaller than a length of a respective pin boss of the at least two pin bosses, wherein:
- the pin boss axis is axially offset from the piston axis by 0.1-1.0 mm;
- a depth of the at least two nadir pockets decreases along the respective length of the at least two nadir pockets from the piston axis toward a respective boss outer side of the two pin bosses;
- the depth of the at least two nadir pockets is from 0.1 to 1.0 mm;
- and
- the at least two nadir pockets extend over a circumferential angle of 30° to 130°.
A piston for an internal combustion engine, comprising two pin bosses configured to receive a gudgeon pin;
- the two pin bosses respectively including a nadir pocket of at least two nadir pockets at α=180°;
- the at least two nadir pockets each extending outward from a central piston axis and having a respective length that is smaller than a length of a respective pin boss of the at least two pin bosses;
- the at least two nadir pockets having a depth from 0.1 to 1.0 mm, the depth of the at least two nadir pockets continuously decreasing along a pin boss axis in a direction extending away from the central piston axis;
- wherein the pin boss axis is axially offset from the central piston axis by 0.1 to 1.0 mm;
- and
- wherein, in a cross section perpendicular to the pin boss axis, the two pin bosses respectively define a circular shape along the entire respective length at a zenith disposed proximal to a piston crown relative to the at least two nadir pockets.
A piston for an internal combustion engine, comprising two pin bosses configured to receive a gudgeon pin;
- the two pin bosses having at least one of a superimposed transverse ovality and a superimposed vertical ovality and respectively having a circumferential boss face in which a nadir pocket of at least two nadir pockets is disposed at α=180°;
- the at least two nadir pockets each extending outward from a piston axis and over a circumferential angle of 30° to 130°;
- the at least two nadir pockets each having a respective length along a pin boss axis that is smaller than a length of a respective pin boss of the at least two pin bosses;
- the at least two nadir pockets respectively having a depth of 0.1 to 1.0 mm from the circumferential boss face, the depth of the at least two nadir pockets continuously decreasing along the respective length in a direction extending away from the piston axis;
- and
- wherein the pin boss axis is axially offset from the piston axis by 0.1 to 1.0 mm and defines an axis of the circumferential angle.
Dependencies are inferred from the claim text.